xref: /openbsd-src/sys/net/if_enc.c (revision db3296cf5c1dd9058ceecc3a29fe4aaa0bd26000)
1 /*	$OpenBSD: if_enc.c,v 1.40 2003/05/03 21:15:11 deraadt Exp $	*/
2 /*
3  * The authors of this code are John Ioannidis (ji@tla.org),
4  * Angelos D. Keromytis (kermit@csd.uch.gr) and
5  * Niels Provos (provos@physnet.uni-hamburg.de).
6  *
7  * This code was written by John Ioannidis for BSD/OS in Athens, Greece,
8  * in November 1995.
9  *
10  * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
11  * by Angelos D. Keromytis.
12  *
13  * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
14  * and Niels Provos.
15  *
16  * Copyright (C) 1995, 1996, 1997, 1998 by John Ioannidis, Angelos D. Keromytis
17  * and Niels Provos.
18  * Copyright (c) 2001, Angelos D. Keromytis.
19  *
20  * Permission to use, copy, and modify this software with or without fee
21  * is hereby granted, provided that this entire notice is included in
22  * all copies of any software which is or includes a copy or
23  * modification of this software.
24  * You may use this code under the GNU public license if you so wish. Please
25  * contribute changes back to the authors under this freer than GPL license
26  * so that we may further the use of strong encryption without limitations to
27  * all.
28  *
29  * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
30  * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
31  * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
32  * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
33  * PURPOSE.
34  */
35 
36 /*
37  * Encapsulation interface driver.
38  */
39 
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/mbuf.h>
43 #include <sys/socket.h>
44 #include <sys/ioctl.h>
45 
46 #include <net/if.h>
47 #include <net/if_types.h>
48 #include <net/route.h>
49 #include <net/bpf.h>
50 
51 #include <net/if_enc.h>
52 
53 #ifdef	INET
54 #include <netinet/in.h>
55 #include <netinet/in_var.h>
56 #endif
57 
58 #ifdef INET6
59 #ifndef INET
60 #include <netinet/in.h>
61 #endif
62 #include <netinet6/nd6.h>
63 #endif /* INET6 */
64 
65 #ifdef ISO
66 extern struct ifqueue clnlintrq;
67 #endif
68 
69 #ifdef NS
70 extern struct ifqueue nsintrq;
71 #endif
72 
73 #include "bpfilter.h"
74 #include "enc.h"
75 
76 #ifdef ENCDEBUG
77 #define DPRINTF(x)    do { if (encdebug) printf x ; } while (0)
78 #else
79 #define DPRINTF(x)
80 #endif
81 
82 struct enc_softc encif[NENC];
83 
84 void	encattach(int);
85 int	encoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
86 	    	       struct rtentry *);
87 int	encioctl(struct ifnet *, u_long, caddr_t);
88 void	encrtrequest(int, struct rtentry *, struct sockaddr *);
89 void	encstart(struct ifnet *);
90 
91 extern int ifqmaxlen;
92 
93 void
94 encattach(int nenc)
95 {
96     struct ifnet *ifp;
97     int i;
98 
99     bzero(encif, sizeof(encif));
100 
101     for (i = 0; i < NENC; i++)
102     {
103 	ifp = &encif[i].sc_if;
104 	snprintf(ifp->if_xname, sizeof ifp->if_xname, "enc%d", i);
105 	ifp->if_softc = &encif[i];
106 	ifp->if_mtu = ENCMTU;
107 	ifp->if_ioctl = encioctl;
108 	ifp->if_output = encoutput;
109 	ifp->if_start = encstart;
110 	ifp->if_type = IFT_ENC;
111 	ifp->if_snd.ifq_maxlen = ifqmaxlen;
112 	ifp->if_hdrlen = ENC_HDRLEN;
113 	if_attach(ifp);
114 	if_alloc_sadl(ifp);
115 
116 #if NBPFILTER > 0
117 	bpfattach(&encif[i].sc_if.if_bpf, ifp, DLT_ENC, ENC_HDRLEN);
118 #endif
119     }
120 }
121 
122 /*
123  * Start output on the enc interface.
124  */
125 void
126 encstart(ifp)
127 struct ifnet *ifp;
128 {
129     struct mbuf *m;
130     int s;
131 
132     for (;;)
133     {
134         s = splimp();
135 	IF_DROP(&ifp->if_snd);
136         IF_DEQUEUE(&ifp->if_snd, m);
137         splx(s);
138 
139         if (m == NULL)
140           return;
141         else
142           m_freem(m);
143     }
144 }
145 
146 int
147 encoutput(ifp, m, dst, rt)
148 struct ifnet *ifp;
149 register struct mbuf *m;
150 struct sockaddr *dst;
151 register struct rtentry *rt;
152 {
153     m_freem(m);
154     return (0);
155 }
156 
157 /* ARGSUSED */
158 void
159 encrtrequest(cmd, rt, sa)
160 int cmd;
161 struct rtentry *rt;
162 struct sockaddr *sa;
163 {
164     if (rt)
165       rt->rt_rmx.rmx_mtu = ENCMTU;
166 }
167 
168 /* ARGSUSED */
169 int
170 encioctl(ifp, cmd, data)
171 register struct ifnet *ifp;
172 u_long cmd;
173 caddr_t data;
174 {
175     switch (cmd)
176     {
177 	case SIOCSIFADDR:
178 	case SIOCAIFADDR:
179 	case SIOCSIFDSTADDR:
180 	case SIOCSIFFLAGS:
181 	    if (ifp->if_flags & IFF_UP)
182 	      ifp->if_flags |= IFF_RUNNING;
183 	    else
184 	      ifp->if_flags &= ~IFF_RUNNING;
185 	    break;
186 
187 	default:
188 	    return (EINVAL);
189     }
190 
191     return 0;
192 }
193